I think the point here goes beyond the printed article. As others have pointed out, it's the "rules" that have interferred from someone getting a tx, not the "reason"
I'm currently taking Marinol. Marinol is considered a "controlled substance". Marinol is man-made derivitive of POT. So, would this eliminate me from that tx list? Probably, considering the "rules" combined with my PAST.
Which brings up the other point - pot has known medical benefits. The only reason they have a man-made version, is to eliminate the stigma attached to marijauna itself.
Sure, we could read the article and say nothing but to remember "don't smoke pot if I ever want a transplant," or, we could bring up valid points about the topic to work around the "problem" of "living to the letter of the law"
It seems they need to know when to bend the rules for some patients, however that will never be if we simply condemn anyone who has ever smoked/used pot, or any other controlled substance.